/Engine/Source/Runtime/GeometryCore/Public/VectorTypes.h
Angle in Radians.
namespace UE { namespace Geometry { template<typename T> T UE::Geometry::SignedAngleR ( const [UE::Math::TVector2](API\Runtime\Core\Math\TVector2)< T > & V1, const [UE::Math::TVector2](API\Runtime\Core\Math\TVector2)< T > & V2 ) } }